Name the stage of cell cycle at which one of the following events occur.
(i) Chromosomes are moved to spindle equator.
(ii) Centromere splits and chromatids separate.
(iii) Pairing between homologous chromosomes takes place.
(iv) Crossing over between homologous chromosomes takes place .

Which of the following events takes place during anaphase stage of mitosis I. Spindle fibres attach to kinetochores of chromosomes II. Centromeres split and chromatids separate III. Chromatids move to opposite poles IV. Nucleolous, Golgi complex and E.R. reform

When synapsis is complete all along the chromosome, the cells are said to have entered a stage of prophase I, where exchange of genetic material takes place between homologous chromosomes. The stage is called

The homologous chromosomes follow the process of synapsis in the stage or Pairing of homologous chromosome takes place in Or During which stage of meiosis, synaptonemal complex is formed

The figure given below represents the stage of cell division. Read the following statements. (i) Nucleolus, Golgi complex and ER reform. (ii) Chromatids move to the opposite pole. (iii) The activity of the recombinase enzyme. (iv) Homologous chromosomes separate while sister chromatids associated at their centromere. (v ) Initiation of the assembly of the mitotic spindle. How many of the above statements is not true with respect to the above figure

Which of the following statement is//are correct ? (i) Formation of rhodopsin takes place in dark adaptation (ii) Destruction of rhodopsin takes place in light adaptation (iii) Destruction of rhodopsin takes place in dark adaptation (iv) Formation of rhodopsin takes place in light adaptation

Analyse the events during every stage of cell cycle and notice how the following two parameters change (i) Number of chromosomes (N) per cell (ii) Amount of DNA content (C) per cell

[A] : Crossing over takes place during pachytene stage . [R] : It is a process of inter change of chromatin material between one sister chromatid of each homologous chromosome .

Decide whether the following statements are True or False Crossing over occurs between the non-sister chromatids of homologous chromosome during meiotic cell division.

Assertion (A). Events in pachytene play a key role in evolutionary changes in organisms Reason (R) .Exchange of genetic material takes place between sister chromatids of homologous chromosomes

During the meiosis cell division , reduction in the number of chromosome and exchange of segments between chromatids take place Analyse what are the significance of these two phenomena.